Subjects: Physics >> Nuclear Physics submitted time 2024-03-28
Abstract: Charge exchange reactions with the intermediate energy can be used to study the complex structure of atomic nuclei from the respect of spin-isospin excitation. By utilizing the radioactive beam line at the Institute of Modern Physics, Chinese Academy of Sciences, charge exchange reaction experiments in inverse kinematics can expand the target nuclides to be studied to neutron-rich nuclei and even unstable nuclei. Based on this, a detector system for charge exchange reaction experiments has been designed, which mainly consists of a 3He gas target, TPC and CsI(Tl) arrays, where the TPC and CsI(Tl) arrays form a ΔE-E system. Using simulation software such as Geant4 and Garfield++, the operating conditions of the TPC were optimized, the kinematic intervals and the basic design of the detector for the experimental study were determined, and the particle discrimination ability of the detection system was investigated. Based on the simulation, the detection system was built.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-03-20
Abstract: The properties of working gases in gas detectors,such as the average ionization energy,Fano factor,and drift velocity,have a significant impact on the preliminary simulation,parameter design,and trajectory reconstruction of the detectors.SeF6,as the target working gas in domestic neutrinoless double beta decay experiments,has unknown parameters that need to be investigated.To study the relevant parameters of this gas,a measurement scheme was designed and the accuracy and reliability of the experimental plan were tested using Ar/CH4=90/10(P10) as the working gas.In the experiment,the average ionization energy of P10 was measured using a grid ionization chamber with an 𝛼 source,yielding a value of 27.10±0.04 eV,and the Fano factor was determined to be 0.175±0.001 when the energy resolution reached 0.91% after subtracting noise through calibration electronics.Additionally,the drift velocity was measured using a 266 nm laser and a time projection chamber,and the results were consistent with the Garfield++ simulation results.The experimental results indicate the feasibility of the measurement scheme and demonstrate high reliability of
the measurement results.This provides a solid foundation for further research on the properties of SeF6.
Subjects: Physics >> Nuclear Physics submitted time 2021-12-25
Abstract: We report the reconstruction method of the fast fission events in 25 MeV/u $^{86}$Kr +$^{208}$Pb reactions at the Compact Spectrometer for Heavy IoN Experiment (CSHINE). The fission fragments are measured by three large-area parallel plate avalanche counters, which can deliver the position and the arrival timing information of the fragments. The start timing information is given by the radio frequency of the cyclotron. Using the velocities of the two fission fragments, the fission events are reconstructed. The broadening of both the velocity distribution and the azimuthal difference of the fission fragments decrease with the folding angle, in accordance with the picture that fast fission occurs. The anisotropic angular distribution of the fission axis also reveals consistently the dynamic feature the fission events.
Peer Review Status:Awaiting Review